50mm Lens

[Falon]

Hi Brian,

My 50mm lens has been terribly bad with focus. Its a canon EF 1.2. Is there some tests I can do at home to see what the problem is?

Thanks

[Brian]

I personally haven't run those home tests, but i will say this...

97% of the time when shooting at f/1.2, you will blow the shot. Especially if you are close to your subject. 

The other 3% of the time that you shoot at 1.2 and nail it, a Chorus of Angels will sing. 

What most people don't realize is you buy a f/1.2 lens to be sharp about one stop down from the widest aperture. So in this case that would be f/1.8. For f/1.4 lenses, that's f/2.0. 

The reason has to to more with a Depth of Field problem than a focus problem. So could you post some examples of what you are experiencing?